How to open the main gate in Jurassic Park Portable / Game Boy (level 1 guide)

Opening the main gate in level 1 of Jurassic Park Portable (Game Boy) is the very first objective, and more or less how every level is structured; gathering or destroying all the eggs in an area, collecting the keycard that drops, then moving to the next location via the door or terminal that then opens the way.
This shows a step-by-step guide for completing level 1. For a walkthrough for the full game, see this video: • Jurassic Park Game Boy...
This was recorded on Analogue Pocket using a PAL version of the Game Boy game.
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